Copper and zinc alloy



Patented May 29, 1923.

Q UNITED stares v tame rn'rna os'rnmaoar, or n'nannoar, nus'ram.

COPPER ZINC ALLOY.

Ho Drawing.

To all whom it may concern:

Be it known that I, Pnrnn OS'I'ENDORF, a Prussian subject, residing ,at Berndorf, Lower Austria, have invented new and useful Improvements in and Relating to Copper and Zinc Alloys, of which the following is a s ecification.

opper and zinc alloys containing more I than 40% of zinc which have been improved by the addition of nickel and manganese, are known.

These known alloys however, cannot be worked when cold as they are far too brittle. On the other hand, copper and zinc alloys containin ,less than 40% of zinc cannot be worked w 'en hot.

For many purposes it is of the greatest importance to obtain an alloy which can be easily worked both cold as well as hot, as many articles made from such allo s have t be worked \both whilst hotas we as'cold in order to give them the particular form it has been found that copper and zinc alloys, easily worked both cold and hot, can be obtained if a preponderating percentage of copper and zinc is alloyed with nickel and manganese, in the presence of a certain proportion of aluminium.

In practice it has beenfound that an addition of 2% of aluminium produces an alqloy satisfactory in every respect, and caalloys of the kind referre copper, nickel, manganese, iron, 25 to 40% of zinc and 11- to 3% of aluminium,'the co per, nickel, manganese and .iron being me ted together, the zinc added to the molten Applicatiomflled October 4, 1922. .Serial No. 592,411.

mixture and finally after some minutes introducing the aluminium.

Suchan alloy may conslst, for instance of 40-55 parts of copper, 3-15 parts of nickel, 1-3 parts of manganese, 1-2 parts of iron, 0.5-3 parts of aluminium and less than 40 parts of zinc. A particularly good alloy consists of 48 parts of copper, 10 parts of nickel, 3 parts of manganese, 2 parts of: iron, 2 parts of aluminium and 35 partsof Z1110. Y

When compounding the alloy, a charge consisting of the required amount of the copper, nickel, manganese, and iron is first melted, the zinc is thenadded and after! some minutes the aluminium is introduced.

After thorough mixing the alloy may be cast in bars, or in any shape desired.

In the improved alloy, nickel, manganese and iron are the 1 principal factors of stren h, while the limited quantity of zinc, and t e percentage of aluminium kept with in the correct limits, cause the alloy to be .workable both whilst cold or hot; it has a very fine grain; is very dense and, very resistant to chemical action compared with known copper'and zinc alloys and'is therefore capable of ,being used advantageously for articles requiring the characteristics recited.

I claim:

1. An improved alloy consisting of 4:0 to

55' parts by weight of copper, 3 to 15 partsby weight of nickel, 1 to 3 parts by weight of manganese, 1 to 2 parts by weight ofi iron, 5- to 3 parts by weight of aluminium and 25 to 40 parts by' weight of zinc.

2. An improved alloy consisting of 48 parts by weight of copper, 10 parts by weight of nickel, 3 parts by weight of manganese, 2 parts by weight of iron, 2 parts by weight of aluminium and 35 parts by weight of zinc.

In testimony whereof I have signed this nesses.

P. OSTENDORF.

Witnesses:

CARL WIEDENBERG, J 011mm Korm.

specification in the presence of two wit- 98 

